You calculate this as follows:
Call the number "x".
x = 0.565656...
100x = 56.565656...
Subtract the first from the second:
100x - x = 56
99x = 56
x = 56/99
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The fraction for .4 repeating is 2/5.
If all 3 digits are repeating then as a fraction it is 215/999
It is: 82/99 = 0.828282.....repeating
It is: 2/15 as a fraction
The answer is 61/495